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Billard ball model
Who made it? Jhon dalton
proposed that each element is made up of atoms that are in-divisible and have a specific mass
he suggested that chemical reactions occur when atoms combine in fixed ratios to form compounds.
J.J thomson Raisin bun model/plum pudding
who made it? JJ thomson
he discorved the electron
the atom is a uniformly packed sphere of positive matter with negatively charged electrons(like raisins in a bun)
Ruther fords model (nuclear model)
who made it? Ernest Rutherford
he concluded that atoms consist of mostly empty space with a dense positively charged nucleus at the center and electrons moving arround this nucleus.
bOhrs Model (Planetary)
Who made it? Niles Bohr
concluded electrons (planets) orbited the nucleus (sun) at fixed energy levels like our solar system
electrons could jump between these levels but not exist in the space between them.
Uncertainty principle
Who made it? Werner heinseberg
showed it was impossible to determine both, the exact position and speed of electrons
Quantum mechanic (electron cloud model)
Who made it? Schrodinger, heinsberg, and others
proposed that electrons do not have a fixed path around the nucleus. the position of the electron can only be described probabilistically
this model is used today.
Note 
Flashcard (127)